They never tell you this in the manuals but it’s best to bias by turning clockwise up to the bias point. If you overshoot, go back down and turn clockwise up. Why? Pots have slop in them. You want to keep tension on the set point.
Play for 20 minutes or so before setting the bias. This will ensure that the components will be warm and not drifting.
If the wall power goes down, as it can on some days, the optimal bias will change. Don’t worry about always checking it. But if the amp sounds a bit off, check the bias. This can happen in some venues with low line voltage when lights and all the equipment is powered up.
